java sort arrays with comparator

/**
 * @author lautturi.com
 * Java example: java comparator class to sort arrays
 */

import java.util.*;
import java.time.*;

public class Lautturi {
	
	public static void main(String[] args) {
		int[][] twoDim = { {1, 2}, {3, 7}, {8, 9}, {4, 2}, {5, 3} };

        Arrays.sort(twoDim, new Comparator<int[]>() {
            @Override
            public int compare(int[] o1, int[] o2) {
                return ((Integer) o2[0]).compareTo(o1[0]);
            }
        });

        System.out.println(Arrays.deepToString(twoDim));
	}
}